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How to Clean the EGR Valve on a Peugeot 308

Model: Peugeot 308 T9, MK 2 - Years: 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021
Part: EGR valve

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Video tutorial

In this video, let's see how to clean the EGR valve on a Peugeot 308, which can become clogged with carbon deposits causing loss of power, jerky acceleration, and the engine light to come on with errors P0400/P0405. Obtain a specific cleaner, such as LiquiMoly, which can be found on eBay with the code 202479232689 for £28.50, with free delivery.

Disconnect the battery to avoid ECU errors, remove the electrical connector, and loosen the fastening bolts.

Detach the intake and exhaust pipes, being careful with the gaskets. Inject the product into the inlet and outlet of the valve and let it sit for 10/15 minutes.

Use a cloth or a brush to remove stubborn deposits. Do not use metal tools, as they risk scratching the seat.

Clean the soot buildup in the ducts and reposition the valve, changing the gaskets. Upon restarting the vehicle, the ECU may need a few miles to recalibrate.


Posted on 15 March 2026 by ScegliAuto


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